This unique building in the main square stands out among the city's typically Baroque architecture.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Elaborate tile work in this railway station tells the story of Portugal.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

A preserved 18th century steel factory.

This house was home to a succession of park keepers for more than 90 years, but in all that time, it never had a toilet.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

One of 200 religious buildings recognized as a “culture monument.” 

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

What happens when you cross a mayor and a painter?

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An alchemist's “magic door” stands in the middle of a Roman park.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Its interior is adorned with some of the best examples of early Christian mosaics.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Cemetery established by the Victorians as a solution to the overflowing graveyards.

In England, an 18th-century water-powered workshop still stands.

A charming beach town in Turkey captures all the colors of the rainbow.